First of all, ditch the Flowmaster idea with the turbos. Chambered mufflers and turbos don't agree, use a set of Dynomax super turbo or Ultra-Flow mufflers instead. You're looking at a solid 15 hp difference between them.
Second, ditch the elctric water pump and flex-a-lite fan. Save your money and run the factory pulley/pump setup (no underdrives) and an SN95 electric fan if you must switch. Running the SN95 fan will likely require a 130amp alternator though.
RE the BTM, your money would probably be better spent having someone who is familiar with turbo tuning burn you a custom chip instead of using the BTM. The response characteristics of the Incon kits require a bit of a unique timing curve that the BTM can't really do. The upside to the chip is that you will also end up having your fuel tables put exactly where they need to be, resulting in more power, and less chance of detonation.
Southside lift bars can also be hell on the torque boxes. If you must use them, plan on reinforcing the frame near the torque boxes before they decide to crack.
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Greg Banish
President,
Detroit Speedworks, Inc.
'93 LX Turbocharged Road Racer
'00 Bad-Ass F150